Best sounding exhaust ever, get a nice new cherry bomb, pour about 1/4 gallon af gas in it, roll it around untill the fiberglass soaks up most of it, pour out the extra gas, throw a match in it and stand back.Thatl burn out the fiberglass and put an expansion chamber in an otherwise straight pipe and give it a nice deep rumble.

 

Dude you are a crazy bastard

 

my friend did it to his dodge d-10 in high school and Ive done it to about everything since I heard how it sounds.

 

go with a super 44 and 2.5 inch tailpipe. ive got that on mine and its sounds great not to loud and no to quiet, just perfect.

 

Ok so i know they look dumb as hell on a jeep but ive got a $30 "titanium race muffler" off ebay that makes my 4 banger VW sound like a 7.3 powerstroke!!! It has twin turn up tips but you could turn them down under the jeep and it would sound pretty awesome i believe!!! Otherwise 14" glasspack with groundpounder is the way to go!!!!

 

Currently on my 2000 xj sport 4.0 i6 I'm running a 2.5inch pipe with no cat stock headers and a flowmaster 40 series and a single pipe out the back with a slash cut 10 inch long tip with a 3 to 3 and a half inch opening. Sounds very well and was a cheap set up. Its not gonna sound like a v8 going down the road but I can tell you that its gonna turn heads sounding that way....no pissed bumble bee at all also........hope this helped...btw the setup ran me $180.00.

 

The OP has had about 15 months to explore options.

 

2.5 - 3 inch piping.....CHERRY BOMB EXTREME, single chamber muffler like the flowmaster 10.

Im running 2.5", no cat, and the extreme, its EPIC!

 

Louisiana has inspection with no emissions test. And I live in Florida now. Zero inspection, zero emissions

 

I have yet to hear any 4.0L exhaust system that has a modified exhaust system sound good. They all sound like farting hondas and nissans to me. Keep in mind, everything I work on and drive has 5 and 6 inch systems with 500 hp cats and cummins for power , LOL